tolong cariin BC ya!!!

3^2 + DC^2 = AC^2
9 + DC^2 = AC^2

5^2 + AC^2 = (4 + DC)^2
25 + 9 + DC^2 = (4 + DC)^2
34 + DC^2 = 16 + 8DC + DC^2
8DC = 18
DC = 9/4 = 2 1/4

BC = 4 + 2 1/4 = 6 1/4